Jimmy-proof lock



M. FORLANDEH.

JIMMY PROOF LOCK.

APPLlcAloN FILED MAR, 7, 192|.

PatentedSept.

5, 1922c 3 SHEETS-SHEET l.

IVI. FoRLANn'EII.

JIMMY PROOF LOCK.

APPLICATION FILED MAR. 7, 1921.

Patented Sept. 5, 1922.

3 SHEETS-SHEET 2.

Nl. FORLANDEH.

JIMMY PROOF LOCK.

APPLICATION FILED III/III` 7. 1921.

Patented Sept. 5, i922.,

3 SHEETS-SHEET 3.

substantially in accordance with the present Patented Sept. 5, 1922.

man

MORRIS FORLANDER, 0F NEW YORK, N. Y.

JIMMY-PROOF LOCK.

Application led March 7, 1921. Serial No. 450,206.

To all whom t may concern.'

Re it known that I, MORRIS FORLANDER, a

citizen of Russia, residin at New York, in 4 the county and State of ew York, have invented certain new and useful Improvements in .Timmy-Proof Locks, of which the followinof is a full, clear, and exact specification.

his invention relates to locks and has for one of its objects to provide a fastener of the sliding bolt type which is jimmyproof and cannot be bodily removed from the door.

The invention contemplates the provision of a lock casing having a projecting dovetailed lug adapted to interlock with 'a keeper so as to prevent said keeper and lock casing from being forced apart by a jimmy. The sliding bolt is mountedin said dove-tailed lug and is protected thereby from being sawed through by a bur lar. The lock casing and keeper are a so provided with flanges for securing them to the edges of the door and jamb to prevent their being bodily removed when in interlocking engagement. Other objects will appear as the description proceeds.

The invention will be rst hereinafter de` scribed in connection with the drawings, which constitute part of this specification, and then more specifically defined in 'the claims at the end of the description.

In the accompanying drawings, wherein similar referencel characters are used to designate corresponding parts throughout the several views:

Figure 1 is an elevation of a lock made invention and applied' to a door and jamb, said lock bein lshown as mounted on the inside face of t e door. A

Figure 2 is a top plan view of the lock as shown in Figure l, parts of the door and jamb being indicated in section.

Figure 3 is a longitudinal horizontalsection through the lock vcasing and keeper showing the bolt in retracted position.

Figure 4 is an' elevation of the face of the lock casing which engages the door.

'Figure 5 is a perspective view of the keeper showing more particularly the dovetail'ed cavity therein to receive the dovetailed lug Vwhich projects from the lock casing. j.

Figure 6 is a detailed perspective view of the tumbler of the loc Figure 7 is a detailed perspective view of the sliding bolt.

Figure 8 is an elevation of the lock and keeper from t-he faces thereof which enga e the. door and jamb, the cover plate for said caslng Which is shown in Figure 4 being removed in this ligure to disclose the bolt operating mechanism, said bolt being shown v in retracted position in solid lines and in projected position in dotted lines, and

Flgure 9 is a similar view of the lock caslngand keeper showing the bolt in partially projected position with the tumbler in position for releasing the bolt.

InFigures 1 and 2, 1 designates a portion of a door and 2 a portion of a jamb. The lock caslng 3 may be secured to the innerl face of the door by screws 4 passed through upper and lower flanges 5. Said casing 3 also has an angularly extending -iange 6 extending along the edge of the door and secured thereto by screws 7, shown in Figure 2. It will be noted that'said screws 7 are concealed when the rdoor is closed so that said casing cannot be removed even though all of the screws 4 are taken out.

The keeper 8 has upper and lower flanges 9 through which screws 10 are passed for engagement with the jamb 2. Said keeper also has an angularly-extending flange 11 secured to the edge of the jamb by screws 12, Figure 2. Said screws 12 prevent the removal lof the keeper when the door is shut in the same manner Aas the screws 7 prevent the removal of the lock casing. v

Projecting from the end of the lock casing is a dove-tailed lug 13 through which the sliding bolt 14 of the lock is adapted to be reciprocated and which is designed to interlock with a correspondingly shaped recess 15` in the keeper when the door is closed.

As shownin'Fi re 5, a recess 15 opens on the inner face o the keeper and on the edge thereof adjacent the lock casing, so that as said lock casing is swung toward the keeper in closing the door, the dove-tailed lug 13 will slip into said recess l5 and interlock therewith, so that it` will be impossible to force the lock and keeper apart with an ordinaryjiminy. The lock casin is also preferably provided with an extension plate 16 Hush with its inner face and extending beyond the dove-tailed lug 13, so as to mask or conceal the same When the door is shut. Said extension plate 16 is preferably provided with openings 17 in its end portion 'which projects beyond the dovetailed lug 13, and projecting studs 18 are provided on the inner face of the keeper to intel-engage with said openings 17, as shown in Figures 1,2 and 3, when the door is shut, for further increasing the security of the fastening.

The bolt 14, which works through the dove-tailed lug 13, has a downwardly oset portion 19 which slides on the bottom of the cavity in the lock casing 3, as best shown in Figures 8 and 9. A tumbler 2O is pivoted at 21 on the bolt and has a lug 22 adapted to normally extend in the path of a fixed lug 23 in the casing, as shown in Figure 8, for preventing the projection of the bolt, said tumbler being normally held in locking position by a spring 24. The'free end portion 25 of the tumbler is adapted to extend up between spaced lugs 26 and 27 on the extension 19 of the bolt. A roll back 28,

mounted on a knob 29. projecting from the inner face of the lock casing, is adapted to engage the end portion 25 of the tumbler and depress. the latter so as to move the lug 22 out of the path of the fixed lug 23, as shown in Figure 9. As the tumbler is depressed, the roll .back moves the bolt longitudinally to project or retract the same, as will be readily understood from a compari son of Figures 8 and 9. Said roll back 28 has flattened side portions 30 to be engaged by a leaf spring 31 for preventing free and unrestricted rotation of the knob 29. A supplemental roll back 32, Figure 3, is carried by a swiveled disk 33 mounted on a cover plate 34 on the face of the lock casing next to the door. Said roll back 32 operates in the same manner as the roll back 28 carried by the pivot 29, and may be controlled by any suitable lock mechanism (not shown) suitably connected thereto and accessible from the outside of the door.

While the present embodiment of the invention has been shown applied to a night latch type of lock with the knob on the inside for operating the bolt, it will be understood that the other features of the lock may be used with equally advantageous results on other types of locks, such as those controlled by keys from both sides. It will be noted that by mounting the bolt 14 through the dove-tailed projecting lug, said bolt is made longer than in an ordinary lock thus increasing the strength of said bolt and .its power of resistance to attempts to force the "lock.

l claim: 1. The combination with a` lock casing having a dove-tailed lug projecting from its vfree end, of an extension plate on the having a dove-tailed lug projecting from its free end, of an extension plate on the front o f said casing overlying said lug and projecting beyond the same, a keeper having a recess to be engagedby said lug when the lock casing is closed upon the keeper, a bolt y mounted in the casing to be projected into the keeper, there being openings in the portion of the extension plate which projects beyond the dove-tailed lug, and studs projecting from the keeper to engage said openings for the purpose specified.

. In testimony whereof l have signed my name to this specification.

MORRlSi FURLANDER. 

